JPH10288196A - Turbo fan device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a main plate of a turbo fan from making contact with a frame plate. SOLUTION: A turbo fan 2 is arranged so that its shaft becomes horizontal, and a truncated conical hub 2d curved forward is provided on a central part of a main plate 2c making a back surface of the turbo fan 2. A fan motor 4 is arranged in a dent on the back surface side of this hub 2d, an output shaft 17 of this fan motor 4 is installed on the hub 2d through a vibration proofing member 18, and a main body 4a of the fan motor 4 is installed on a frame plate 1 on its back. A first magnet 31 is provided on a back surface of the main plate 2c of the turbo fan 2 and at a position on a circumference around the hub 2d. Simultaneously, a second magnet 32 repelling in the longitudinal direction by magnetic force against the first magnet 31 is provided at a position in front of the frame plate 1 and on a circumference facing against the first magnet 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a turbofan device. Typically, the present invention relates to a turbofan device in which a shaft of a fan motor is arranged in a horizontal direction, such as used in an indoor unit of an air conditioner.

[0002]

2. Description of the Related Art Recently, in order to make an indoor unit of an air conditioner thinner in the front-rear direction, the present applicant has installed a turbo fan (impeller) in a casing of the indoor unit as schematically shown in FIG. ) 102 has been proposed in which the axis is arranged in the front-rear direction (left-right direction in the figure) (Japanese Patent Application No. 8-2777).
No. 96). The turbo fan 102 includes a side plate 102a having an annular base portion 102e curved on the front side, a main plate 102c provided on the rear side, and a blade 102b provided between the side plate 102f and the main plate 102c. Have. At the center of the main plate 102c, a truncated conical hub 102d that curves to the front side is provided, and the fan motor 104 is disposed in a recess on the rear side of the hub 102d. The output shaft 117 of the fan motor 104 is connected to the ring-shaped anti-vibration rubber 11 in order to avoid the occurrence of cogging noise (mechanical noise generated by the DC motor) at the time of start or the like.
8 to the hub 102d. On the other hand, the main body 104a of the fan motor 104 is connected to the frame plate 1 on the rear side.
01. The frame plate 101 is attached to the interior chassis 120 along the interior wall surface 190. On the front side of the turbo fan 102, a heat exchanger 103 having a substantially rectangular plate-like outer shape is supported by a support portion 123 of the internal chassis 120. In order to make the indoor unit thinner in the front-rear direction, a substantially square opening 103a (having a front cover 107) is provided at the center of the heat exchanger 103, and the output shaft 117 of the fan motor 104 is provided.
Is inserted into the opening 103a.
Between the heat exchanger 103 and the turbo fan 102,
Partition plate having bell mouth 121 (internal chassis 120
) 122 are arranged. The bell mouth 121 is formed by forming a circular hole in the center of the partition plate 122 and curving the edge of the circular hole toward the rear surface side, and enters the inside of the mouthpiece 102 e of the turbofan 102. .

When the turbo fan 102 is driven to rotate by the fan motor 104, room air R1 and R2 are sucked in from the front side of the casing and exchanged heat while passing through the heat exchanger 103. It passes through the mouse 121 and the mouthpiece 102e, and is simultaneously blown outward in the radial direction by the blade 102b in multiple directions. The blown air flows and circulates along the wall surface 190, the ceiling surface, and the floor surface so as to wrap the room, so that a draft feeling can be eliminated and comfort can be improved.

[0004]

However, in the above-described structure, the axis of the turbo fan 102 is inclined due to the influence of gravity or the aging of the vibration isolation rubber 118, and the main plate 102c of the turbo fan 102 and the frame are not tilted. The distance δ between the main plate 10 and the main plate 10 of the turbofan 102 decreases.
There is a problem that 2c contacts the frame plate 101.

An object of the present invention is to provide a turbofan device which can prevent a main plate of a turbofan from contacting a frame plate.

[0006]

According to a first aspect of the present invention, there is provided a turbofan device having a main plate forming a rear surface of the turbofan, wherein the turbofan is disposed so that its axis is horizontal. A truncated cone-shaped hub that curves forward is provided at the center of the fan motor, a fan motor is arranged in a recess on the rear side of the hub, and an output shaft of the fan motor is attached to the hub via a vibration isolating member. In a turbofan device in which a main body of a fan motor is attached to a frame plate at the rear thereof, a first magnet is provided on a rear surface of the main plate of the turbofan at a position on a circumference around the hub, and a first magnet is provided at a front surface of the frame plate. A second magnet is provided at a position on the circumference facing the first magnet, the second magnet being repelled in the front-rear direction by a magnetic force with respect to the first magnet.

In the turbofan device according to the first aspect, the first magnet provided on the rear surface of the main plate of the turbofan and the second magnet provided on the front surface of the frame plate repel each other by magnetic force. Therefore, even if the axis of the turbo fan tilts due to the influence of gravity or the aging of the vibration isolating member, the position of the turbo fan is changed by the repulsive force between the first magnet and the second magnet even when the position of the turbo fan is going to shift. Corrected, the distance between the main plate and the frame plate of the turbofan is kept constant over the entire circumference. Therefore, the main plate of the turbofan is prevented from contacting the frame plate. Further, it is possible to avoid a situation in which the main plate of the turbofan comes into contact with the frame plate due to the tolerance of each part of the turbofan or the fan motor. As the position accuracy of the turbo fan is increased in this way,
By design, the distance between the main plate and the frame plate of the turbofan can be reduced. Therefore, when an indoor unit of an air conditioner is configured using the turbo fan device, the indoor unit can be thinned in the front-rear direction by that much. In addition, when an indoor unit of an air conditioner is configured using this turbofan device, the positional relationship between the turbofan and a bell mouth or a heat exchanger is kept constant, so that indoor air is stored in the indoor unit. Time-dependent changes in the sound and air volume when sucked are suppressed.

According to a second aspect of the present invention, there is provided the turbofan device according to the first aspect, wherein the radial width of the first magnet is set smaller than the radial width of the second magnet. It is characterized by being.

In the turbofan device according to the second aspect, since the radial width of the first magnet is set smaller than the radial width of the second magnet, the magnetic field received by the first magnet from the second magnet is reduced. It becomes uniform in the radial direction. Therefore, even if the turbo fan slightly swings in the radial direction at the time of rotation of the turbo fan, the first magnet receives a constant repulsive force stably from the second magnet, and the position accuracy of the turbo fan increases. In addition, an increase in the weight of the turbofan due to the provision of the first magnet is suppressed.

According to a third aspect of the present invention, in the turbofan device according to the first or second aspect, both the first magnet and the second magnet are continuous over the entire circumference. .

In the turbofan device according to the third aspect, since both the first magnet and the second magnet are continuous over the entire circumference, the repulsive force of each other becomes constant in the circumferential direction. Therefore, the position accuracy of the turbo fan is further improved. In addition, a change in the magnetic field, that is, no electromagnetic noise is applied to other electric components when the turbofan rotates.

According to a fourth aspect of the present invention, in the turbofan device according to the first or second aspect, one of the first magnet and the second magnet is intermittently arranged in a circumferential direction. The other of the first magnet and the second magnet is continuous over the entire circumference.

In the turbofan device according to the present invention, one of the first magnet and the second magnet is intermittently arranged in the circumferential direction. It is sufficient to prepare a plurality of magnets. Such arc-shaped magnets can be obtained at a lower cost than a perfectly circular magnet when compared at the same weight. Moreover, since the arc-shaped magnets are arranged on the circumference with a gap, the required number of arc-shaped magnets is reduced as compared with a case where the magnets are densely arranged without a gap. Therefore, the material cost is reduced as compared with the case where a perfect circular magnet is prepared. If the gap between the ends of the arc-shaped magnet is reduced to some extent, the magnetic force of the arc-shaped magnet becomes substantially constant in the circumferential direction. Therefore,
The repulsive force between the first magnet and the second magnet can be made substantially constant in the circumferential direction.

According to a fifth aspect of the present invention, in the turbofan device according to the first or second aspect, both the first magnet and the second magnet are intermittently arranged in a circumferential direction. Features.

In the turbofan device according to the fifth aspect, since both the first magnet and the second magnet are intermittently arranged in the circumferential direction, a plurality of small arc-shaped magnets are required to constitute both magnets. Just prepare. Therefore, claim 4
The material cost is further reduced as compared with If the gap between the ends of the arc-shaped magnets is reduced to some extent, the magnetic force due to them becomes substantially constant in the circumferential direction. Therefore, the repulsive force between the first magnet and the second magnet can be made substantially constant in the circumferential direction, similarly to the fourth aspect.

[0016]

Embodiments of the present invention will be described below in detail.

FIG. 1A shows an example in which the turbofan device of one embodiment is applied to an indoor unit of an air conditioner. In addition, the casing of the indoor unit is omitted for easy understanding.

In FIG. 1A, reference numeral 1 denotes a substantially square frame plate attached to the indoor wall surface 90, and reference numeral 2 denotes a horizontal axis-arranged air sucked from the front side (left side in FIG. 1A). Is a heat exchanger disposed on the front side of the turbo fan 2.

The turbo fan 2 has a side plate 2a having an annular base portion 2e curved to the front side, a main plate 2c provided on the rear side, and a rearward direction provided between the side plates 2f and the main plate 2c. And a blade 2b (see FIG. 2).
At the center of the main plate 2c, a frustoconical hub 2d that curves to the front side is provided, and the fan motor 4 is arranged in a recess on the rear side of the hub 2d. Then, in order to avoid the occurrence of cogging noise (mechanical abnormal noise generated by the DC motor) at the time of starting or the like, the output shaft 17 of the fan motor 4 is attached to the hub 2d via a rubber ring 18 as an anti-vibration member. ing. On the other hand, the main body 4a is attached to the rear side frame plate 1. This frame plate 1 is provided with an internal chassis 2
0, and is attached along the indoor wall surface 90 in the vertical direction.

At the rear surface of the main plate 2c of the turbo fan 2, a ring-shaped first magnet 31 continuous over the entire circumference is embedded at a position on the circumference around the hub 2d. At the same time, a ring-shaped second magnet 32 continuous over the entire circumference is buried at a position on the circumference facing the first magnet 31 on the front surface of the frame plate 1. The centers of the first magnet 31 and the second magnet 32 are arranged on one straight line passing through the center of the hub 2d so that the positional relationship does not change when the turbo fan 2 rotates. FIG. 1 (b) which is an enlarged view of part B of FIG. 1 (a).
As shown in FIG. 5, the first magnet 31 has an S pole on the front side and an N pole on the rear side, whereas the second magnet 32 has an N pole on the front side and an S pole on the rear side. Therefore, the first magnet 31 and the second magnet 32 repel each other in the front-rear direction by the magnetic force. As shown in FIG. 2 (the turbo fan 2 is viewed from the front with the side plate 2a omitted), the first magnet 31
Since both the second magnet 32 and the second magnet 32 are continuous over the entire circumference, their repulsion is constant in the circumferential direction.
Further, as can be seen from the figure, since the radial width of the first magnet 31 is set smaller than the radial width of the second magnet 32, the magnetic field received by the first magnet 31 from the second magnet 32 is It is uniform in the direction. At the same time, an increase in the weight of the turbofan 2 due to the provision of the first magnets 31 is suppressed.

The heat exchanger 3 shown in FIG. 1 (a) has a number of heat exchange fins (not shown) in a meandering type cooling pipe.
Are laminated and attached, and have an outer shape of a thin, substantially rectangular plate. A substantially square opening 3a is provided at the center of the heat exchanger 3, and the opening 3a is provided.
a front cover 7 is attached. This heat exchanger 3
Is supported by the support portion 23 of the internal chassis 20. Here, in order to make the indoor unit thinner in the front-rear direction, the front end of the output shaft 17 of the fan motor 4 is in a state of being inserted into the opening 3a. Note that the size of the indoor unit in the front-rear direction may be increased so that the front end position of the output shaft 17 is retracted with respect to the heat exchanger 3, and the opening 3a and the cover 7 may be omitted (replacement with cooling tubes and fins) ).

Between the heat exchanger 3 and the turbo fan 2,
A partition plate (a part of the internal chassis 20) 22 having a bell mouth 21 is arranged. This bellmouth 21
Is formed by forming a circular hole at the center of the partition plate 22 and curving the edge of the circular hole toward the rear surface side, and enters the inside of the mouthpiece 2 e of the turbofan 2.

When the turbo fan 2 is rotationally driven by the fan motor 4, the room air R1,
R2 is sucked and heat exchanged in the process of passing through the heat exchanger 3, and the heat-exchanged air R1 and R2 pass through the bell mouth 21, the mouthpiece 2e, and radially outward by the blade 2b.
It is blown out in multiple directions simultaneously. The blown air is on the wall 9
0, it flows and circulates along the ceiling surface and the floor surface to wrap around the room, so that the draft feeling can be eliminated and the comfort can be improved.

Here, the first magnet 31 provided on the rear surface of the main plate 2c of the turbofan 2 and the second magnet 32 provided on the front surface of the frame plate 1 repel each other by magnetic force. In addition, the width of the first magnet 31 in the radial direction is
Is set smaller than the radial width of the first magnet 31, the magnetic field received by the first magnet 31 from the second magnet 32 is uniform in the radial direction. Even if it swings, the first magnet 3
1 stably receives a constant repulsive force from the second magnet 32.
Also, since both the first magnet 31 and the second magnet 32 are continuous over the entire circumference, the repulsive force of each other is constant in the circumferential direction. Therefore, even if the axis of the turbo fan 2 is inclined due to the influence of gravity or the secular deterioration of the vibration isolating rubber 18 and the position of the turbo magnet 2 is to be shifted, the first magnet 31 and the second magnet 31 cannot be displaced.
The position of the turbofan 2 is corrected by the repulsion between the magnet 32 and the main plate 2 c of the turbofan 2 and the frame plate 1.
Can be kept constant over the entire circumference.
Therefore, the main plate 2c of the turbo fan 2 is
Contact can be prevented. In addition, it is possible to avoid a situation in which the main plate 2c of the turbo fan 2 comes into contact with the frame plate 1 due to tolerances of various parts of the turbo fan 2 and the fan motor 4.

Since the position accuracy of the turbo fan 2 can be improved in this way, the main plate 2 of the turbo fan 2 is rather designed.
The distance δ between c and the frame plate 1 can be reduced. Therefore, the thickness of the indoor unit can be reduced in the front-rear direction.

Further, since the positional relationship between the turbo fan 2 and the bell mouth 21 or the heat exchanger 3 can be kept constant, the sound and the air volume when the indoor air R1 is sucked into the indoor unit can be changed over time. Can be suppressed.

Further, since the position accuracy of the turbo fan 2 can be improved, a change in a magnetic field, that is, an electromagnetic noise is not given to other electric components when the turbo fan 2 rotates.

As shown in FIGS. 3 and 4, one of the first magnet 31 and the second magnet 32 may be intermittently arranged in the circumferential direction. FIG. 3 shows an example in which the first magnet 31 is configured using eight arc-shaped magnets 31a, and FIG.
Is shown using eight arc-shaped magnets 32a. Such arc-shaped magnets 31a and 32a can be obtained at a lower cost than a perfectly circular magnet when compared at the same weight. Moreover, since the arc-shaped magnets 31a, 32a are arranged on the circumference with gaps 31g, 32g, the required number of arc-shaped magnets can be reduced as compared with a case where the magnets are densely arranged without gaps. Therefore, the material cost can be reduced as compared with the case where a perfect circular magnet is prepared. If the gaps 31g, 32g between the end portions of the arc-shaped magnets 31a, 32a are reduced to some extent, the magnetic force due to them becomes substantially constant in the circumferential direction. Therefore, the repulsive force between the first magnet 31 and the second magnet 32 can be made substantially constant in the circumferential direction.

As shown in FIG. 5, both the first magnet 31 and the second magnet 32 may be intermittently arranged in the circumferential direction. FIG. 5 shows that the first magnet 31 is divided into eight arc-shaped magnets 31a.
And an example in which the second magnet 32 is configured using eight arc-shaped magnets 32a. In this case, the material cost can be further reduced as compared with the cases of FIGS. By reducing the gaps 31g, 32g between the ends of the arc-shaped magnets 31a, 32a to a certain extent, the repulsive force between the first magnet 31 and the second magnet 32 can be made substantially constant in the circumferential direction. Figures 3 and 4
Is the same as

The number of divisions of the first magnet 31 and the second magnet 32 is not limited to eight. Also,
The first magnet 31 and the second magnet 32 may have different numbers of divisions. Therefore, the first magnet 31 and the second magnet 32
As the arc-shaped magnet constituting the above, commercially available inexpensive magnets can be widely used.

It is not necessary to use preformed magnets as the first magnet 31 and the second magnet 32. For example,
A powdery magnetic material is applied in a ring shape on the rear surface of the main plate 2c of the turbofan 2 and the front surface of the frame plate 1 and applied, and an external magnetic field is applied to the magnetic material, as shown in FIG. It may be magnetized like the polarity shown. In this case, the first magnet and the second magnet can be provided at a lower cost.

Although the rubber ring 18 is employed as the vibration isolating member, other elastic materials capable of absorbing vibration may be employed.

[0033]

As apparent from the above description, in the turbofan device of the first aspect, the first magnet provided on the rear surface of the main plate of the turbofan and the second magnet provided on the front surface of the frame plate.
Since the magnet and the magnet repel each other due to the magnetic force, the turbo fan's main plate contacts the frame plate even if the turbo fan's axis is tilted due to the influence of gravity or the secular deterioration of the vibration isolating member, and it tries to shift its position. Can be prevented. Further, it is possible to avoid a situation in which the main plate of the turbofan comes into contact with the frame plate due to the tolerance of each part of the turbofan or the fan motor. Since the position accuracy of the turbofan is increased in this way, the distance between the main plate and the frame plate of the turbofan can be rather reduced by design. Therefore, when an indoor unit of an air conditioner is configured using the turbo fan device, the indoor unit can be thinned in the front-rear direction by that much. In addition, when an indoor unit of an air conditioner is configured using this turbo fan device, the positional relationship between the turbo fan and a bell mouth or a heat exchanger can be kept constant, and the indoor air is stored in the indoor unit. It is possible to suppress a change with time in the sound and the air volume when sucked.

In the turbo fan device according to the second aspect,
Since the radial width of the first magnet is set smaller than the radial width of the second magnet, the magnetic field received by the first magnet from the second magnet becomes uniform in the radial direction. Therefore, even if the turbo fan slightly swings in the radial direction at the time of rotation of the turbo fan, the first magnet receives a constant repulsive force stably from the second magnet, and the position accuracy of the turbo fan increases. Moreover,
An increase in the weight of the turbofan due to the provision of the first magnet is suppressed.

In the turbofan device according to the third aspect,
Since both the first magnet and the second magnet are continuous over the entire circumference, the repulsive force of each becomes constant in the circumferential direction, and the position accuracy of the turbofan further increases. In addition, a change in the magnetic field, that is, no electromagnetic noise is applied to other electric components when the turbofan rotates.

In the turbo fan device according to the fourth aspect,
Since one of the first magnet and the second magnet is intermittently arranged in the circumferential direction, it is sufficient to prepare a plurality of small arc-shaped magnets to constitute one of the magnets. The material cost can be reduced as compared with the case of preparing.

In the turbofan device according to the fifth aspect,
Since both the first magnet and the second magnet are intermittently arranged in the circumferential direction, a plurality of small arc-shaped magnets may be prepared to constitute both magnets.
Further, material costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an indoor unit of an air conditioner to which a turbofan device according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing the turbo fan in FIG. 1 as viewed from the front with a side plate omitted.

FIG. 3 is a diagram showing an example in which a first magnet is divided into eight.

FIG. 4 is a diagram showing an example in which a second magnet is divided into eight.

FIG. 5 is a diagram showing an example in which both a first magnet and a second magnet are divided into eight.

FIG. 6 is a longitudinal sectional view showing an indoor unit of a conventional air conditioner.

[Description of Signs] 1 Frame plate 2 Turbo fan 3 Heat exchanger 31 First magnet 32 Second magnet 31a, 32a Arc-shaped magnet

Claims (5)

[Claims] 1. A hub having a truncated conical shape, wherein a turbofan (2) is disposed so that its axis is horizontal, and is curved forward at the center of a main plate (2c) forming a rear surface of the turbofan (2). (2d), a fan motor (4) is disposed in a recess on the rear surface side of the hub (2d), and the output shaft (17) of the fan motor (4) is connected to the hub via a vibration isolating member (18). (2d), the main body (4a) of the fan motor (4) is attached to the frame plate (1) behind the fan motor (4).
The first fan (31) is provided at a position on the circumference of the hub (2d) on the rear surface of the main plate (2c) of the turbofan (2), and the frame plate ( A second magnet (32) that repels in the front-rear direction by a magnetic force with respect to the first magnet (31) is provided at a position on the circumference facing the first magnet (31) on the front surface of 1). Characteristic turbofan device. 2. The turbo fan device according to claim 1, wherein a radial width of the first magnet is greater than a width of the second magnet.
A turbofan device characterized in that it is set smaller than the radial width of 2). 3. The turbofan device according to claim 1, wherein both the first magnet (31) and the second magnet (32) are continuous over the entire circumference. . 4. The turbofan device according to claim 1, wherein one of the first magnet (31) and the second magnet (32) is intermittently arranged in a circumferential direction, and the first magnet (3
A turbofan device wherein the other of the first and second magnets (32) is continuous over the entire circumference. 5. The turbofan device according to claim 1, wherein both the first magnet (31) and the second magnet (32) are intermittently arranged in a circumferential direction. Turbo fan device.